I don't shoot Canon, but it's been my experience that your choice of lens would be very limiting. I have a 24-120mm f/3.5-5.6 as my walk'in 'round lens and have settled on that sometine ago. When I first got my DSLR, I thought a 35-70 f/2.8 was it. Then I tried a 17-35 f/2.8. For a light kit, I use the 24-120 and keep a 20mm f/2.8 in a belt pouch. I have been very happy with this combo for several years.